Friday at 9 on “Happy Days,” snooty people invited Fonzie to a posh dinner party, hoping to make a fool of him. At 9:30 on “Laverne and Shirley,” Mr. Shotz hires a psychiatrist to evaluate his employees’ aptitude. Catch an hour of great laughs from the 1970s tonight. Then stayed tuned for News 8 at 10 on WGAL 8.2, MeTV Susquehanna Valley!